{"id":9792,"date":"2018-10-31T11:26:54","date_gmt":"2018-10-31T11:26:54","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9792"},"modified":"2018-11-18T10:27:50","modified_gmt":"2018-11-18T10:27:50","slug":"suivez-larrivee-de-46p-wirtanen-la-comete-de-lannee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/10\/31\/suivez-larrivee-de-46p-wirtanen-la-comete-de-lannee\/","title":{"rendered":"Suivez l&#8217;arriv\u00e9e de 46P\/Wirtanen, la com\u00e8te de l&#8217;ann\u00e9e"},"content":{"rendered":"<p><strong>Avec une magnitude estim\u00e9e \u00e0 3 pour le d\u00e9but du mois de d\u00e9cembre, 46P\/Wirtanen s&#8217;annonce comme une com\u00e8te prometteuse \u00e0 suivre avant les f\u00eates.\u00a0<\/strong><\/p>\n<p>Le 17 janvier 1948 l&#8217;astronome am\u00e9ricain Carl Alvar Wirtanen d\u00e9couvrit un astre chevelu sur une photographie r\u00e9alis\u00e9e deux jours plus t\u00f4t \u00e0 l&#8217;Observatoire Lick. L&#8217;astre qui allait porter son nom est une com\u00e8te p\u00e9riodique qui fait le tour du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/15\/se-forme-halo-autour-soleil\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a> en 5,44 ans. En 2018 46P\/Wirtanen passera \u00e0 un peu plus de 11 millions de kilom\u00e8tres de la Terre le 11 d\u00e9cembre (quatre jours avant son p\u00e9rih\u00e9lie), entrant ainsi dans le top 10 des com\u00e8tes les plus proches de ces cinquante derni\u00e8res ann\u00e9es.<\/p>\n<figure id=\"attachment_9793\" aria-describedby=\"caption-attachment-9793\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen.jpg\" rel=\"lightbox[9792]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9793\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen-450x265.jpg\" alt=\"\" width=\"450\" height=\"265\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen-450x265.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen-768x453.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen-1024x603.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen.jpg 1086w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9793\" class=\"wp-caption-text\">On peut suivre sur ce montage photographique l&#8217;\u00e9volution de la com\u00e8te 46P\/Wirtanen qui a gagn\u00e9 deux magnitudes en un mois. \u00a9 Justin Tilbrook<\/figcaption><\/figure>\n<p>Sur ce montage photographique de <a href=\"https:\/\/www.facebook.com\/profile.php?id=100009890206715\" target=\"_blank\" rel=\"noopener\">Justin Tilbrook<\/a>, on peut voir l&#8217;\u00e9volution de l&#8217;\u00e9clat de la com\u00e8te qui est pass\u00e9e de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 11 \u00e0 magnitude 9 entre le 15 septembre et le 18 octobre, \u00e9poque o\u00f9 elle se trouvait au niveau de l&#8217;orbite de la plan\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/10\/21\/mars-la-planete-quon-peut-parfois-toucher-du-doigt\/\" target=\"_blank\" rel=\"noopener\">Mars<\/a>.<!--more--><\/p>\n<p>Bien que le noyau de cet astre chevelu ne soit pas tr\u00e8s gros (environ 1 km de large, \u00e0 comparer aux 40 km du noyau de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/02\/anniversaire-la-grande-comete-hale-bopp-cetait-il-y-a-20-ans\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te Hale-Bopp<\/a> par exemple), les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\" rel=\"noopener\">astronomes<\/a> consid\u00e8rent que 46P\/Wirtanen est une com\u00e8te &#8220;hyperactive&#8221; : on a mesur\u00e9 jusqu&#8217;\u00e0 1,7X10<sup>28\u00a0 \u00a0<\/sup>mol\u00e9cules d&#8217;eau \u00e9ject\u00e9es du noyau chaque seconde, des mol\u00e9cules m\u00e9lang\u00e9es avec du carbone diatomique \u00e0 l&#8217;origine de la couleur verte de la com\u00e8te.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen2.jpg\" rel=\"lightbox[9792]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9795\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen2-450x286.jpg\" alt=\"\" width=\"450\" height=\"286\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen2-450x286.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen2-768x488.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen2.jpg 1004w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>46P\/Wirtanen est tr\u00e8s basse sur l&#8217;horizon SUD au cours du mois de novembre puis s&#8217;\u00e9l\u00e8ve rapidement d\u00e9but d\u00e9cembre. Les meilleures observations se feront du 5 au 15 d\u00e9cembre (avec un passage la nuit du 15 au 16 non loin de l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/01\/les-hyades-et-les-pleiades-derriere-le-moulin-de-verzenay\/\" target=\"_blank\" rel=\"noopener\">amas des Pl\u00e9iades<\/a>, l&#8217;occasion de faire de belles photos) avant le retour de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/10\/25\/pleine-lune-doctobre-dans-une-lampe-tempete\/\" target=\"_blank\" rel=\"noopener\">Lune<\/a> (cartes d\u00e9taill\u00e9es sur le site <a href=\"http:\/\/www.cometwatch.co.uk\/comet-46p-wirtanen\/\" target=\"_blank\" rel=\"noopener\"><em>Comet Watch<\/em><\/a>).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen3.jpg\" rel=\"lightbox[9792]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9796\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen3-450x336.jpg\" alt=\"\" width=\"450\" height=\"336\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen3-450x336.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen3-768x574.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/10\/wirtanen3.jpg 847w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Sachez enfin pour la petite histoire que 46P\/Wirtanen \u00e9tait la cible initiale de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/29\/rosetta-etudie-la-magnetosphere-de-la-comete-67p\/\" target=\"_blank\" rel=\"noopener\">Rosetta<\/a> ; suite \u00e0 un retard de lancement la sonde europ\u00e9enne avait finalement \u00e9t\u00e9 envoy\u00e9e vers la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/06\/rosetta-survole-la-comete-tchouri-en-rase-motte\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te Tchouri<\/a> (67P\/Tchourioumov-Gu\u00e9rassimenko).<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Avec une magnitude estim\u00e9e \u00e0 3 pour le d\u00e9but du mois de d\u00e9cembre, 46P\/Wirtanen s&#8217;annonce comme une com\u00e8te prometteuse \u00e0 suivre avant les f\u00eates.\u00a0 Le 17 janvier 1948 l&#8217;astronome am\u00e9ricain Carl Alvar Wirtanen d\u00e9couvrit un astre chevelu sur une photographie r\u00e9alis\u00e9e deux jours plus t\u00f4t \u00e0 l&#8217;Observatoire Lick. L&#8217;astre qui allait porter son nom est &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/10\/31\/suivez-larrivee-de-46p-wirtanen-la-comete-de-lannee\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Suivez l&#8217;arriv\u00e9e de 46P\/Wirtanen, la com\u00e8te de l&#8217;ann\u00e9e<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":9793,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[713,2587,1880,2588,471],"class_list":["post-9792","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-amas-des-pleiades","tag-carl-alvar-wirtanen","tag-comete-46pwirtanen","tag-observatoire-lick","tag-sonde-rosetta"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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